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Thermodynamic properties of sodalite at temperatures from 15 K to 1000 K

✍ Scribed by Norikazu Komada; Edgar F. Westrum; Jr.; Bruce S. Hemingway; Mikhail Yu. Zolotov; Yury V. Semenov; Igor L. Khodakovsky; Lawrence M. Anovitz

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
521 KB
Volume
27
Category
Article
ISSN
0021-9614

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✦ Synopsis

The heat capacity of sodalite was measured with a computerized adiabatic calorimetric system at temperatures from 15 K to 350 K and with a d.s.c. from 340 K to 1000 K. No anomalies were observed over the entire range except for a peak at T1250 K associated with fusion of NaCl(aq) fluid inclusions. The temperature of the spontaneous freezing of the fluid inclusions was remarkably reproducible, and the metastable liquid phase persisted from T=250 K to 200 K upon cooling. The standard molar entropy for the end-member composition: Na8(Al6Si6O24)Cl2 is 102.0β€’R at T=298.15 K. The enthalpy of solution of sodalite was measured in 2PbOβ€’B2O3(l) at T=973 K with a Calvet-type calorimeter. The value of DsolHΒ°m(973 K) is (58.9820.71)β€’10 3 β€’Rβ€’K. The calculated standard molar enthalpy and standard molar Gibbs free energy of formation for Na(Al6Si6O24)Cl2 are -(1618.621.9)β€’10 3 β€’Rβ€’K and -(1527.922.0)β€’10 3 β€’Rβ€’K, respectively. 7 1995 Academic Press Limited a A large portion of the work reported here is a part of the dissertation of one of the authors (N.K.) submitted to the H. H. Rackham School of Graduate Studies of the University of Michigan in partial fulfillment of the requirements for the Ph.D. in Chemistry.

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